[CMake] ExternalProject: how to avoid reinstalling after 'make clean'?

[Cedric Doucet]

Hello! 

No one knows how to avoid spurious installations with external projects? 

Thank you, 

Cédric 

----- Mail original -----

> De: "Cedric Doucet" <cedric.doucet at inria.fr>
> À: cmake at cmake.org
> Envoyé: Vendredi 24 Avril 2015 11:35:54
> Objet: ExternalProject: how to avoid reinstalling after 'make clean'?

> Hello,

> I use the ExternalProjet_Add function to download and install third-party
> libraries.
> Here is an example of a CMakeLists file containing such a call:

> =====================================
> cmake_minimum_required (VERSION 2.6)

> project (example CXX)

> set(CMAKE_VERBOSE_MAKEFILE ON)

> include(ProcessorCount)
> ProcessorCount(N)
> if(NOT N EQUAL 0)
> set(CMAKE_BUILD_FLAGS -j${N})
> endif()

> include(ExternalProject)
> set(EXTERNAL_DIR ${CMAKE_CURRENT_BINARY_DIR})
> ExternalProject_Add(eigen
> PREFIX ${EXTERNAL_DIR}/eigen
> DOWNLOAD_DIR ${EXTERNAL_DIR}/eigen/download
> SOURCE_DIR ${EXTERNAL_DIR}/eigen/src
> BINARY_DIR ${EXTERNAL_DIR}/eigen/build
> STAMP_DIR ${EXTERNAL_DIR}/eigen/stamp
> INSTALL_DIR ${EXTERNAL_DIR}/eigen/install
> URL http://bitbucket.org/eigen/eigen/get/3.2.4.tar.gz
> URL_MD5 4d0d77e06fef87b4fcd2c9b72cc8dc55
> CMAKE_ARGS -D CMAKE_INSTALL_PREFIX=<INSTALL_DIR>
> )

> =====================================

> Everything works fine, except after calling "make clean".
> Thanks to URL_MD5, the third-party library is not downloaded again.
> However, configuration, build and install steps are performed again whereas
> the library has not been uninstalled during cleaning.

> How could I tell to ExternalProject_Add not to configure/build/install my
> library unless this library has been removed from my computer?

> Thank you very much for your help!

> Cédric
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